1. Epidemiology Unit, London School of Hygiene and Tropical Medicine, London, UK
2. Department of Social Medicine & Health Care Administration, Faculty of Medicine, Masaryk University, Brno, Czech Republic
3. Department of Sociology, University of Stockholm, Stockholm, Sweden
4. European Centre on Health of Societies in Transition, London School of Hygiene and Tropical Medicine, London, UK
5. Department of Epidemiology and Public Health, University College, London, UK
6. Centre of Epidemiology and Microbiology, National Institute of Health, Prague, Czech Republic.